Arrange the following points in a sequence to draw the geometrical representation of `"" _(20)Ca^(40)` . (1)Protons and neutrons are shown in the nucleus.(2) Writing the electronic configuration of the atom.(3)Arrange the electrons in shells around the nucleus following the electronicco nfiguration.(4) Calculation of the number of protons and neutrons.(5)Identification of the atomic number and mass number of the atom.

Options

A. 5, 4, 3, 2, 1
B. 5, 4, 1, 2, 3
C. 1, 2, 3, 4, 5
D. 3, 1, 2, 4, 5

Explanation

To draw the geometrical representation of the calcium atom represented as `20Ca40`, we need to follow a specific sequence of steps. Here’s how to arrange the points in the correct order:

### Step-by-Step Solution:

1. **Identification of the atomic number and mass number of the atom**:
- For calcium (Ca), the atomic number (Z) is 20 and the mass number (A) is 40. This means that calcium has 20 protons and a total of 40 nucleons (protons + neutrons).

2. **Calculation of the number of protons and neutrons**:
- The number of protons is equal to the atomic number, which is 20.
- The number of neutrons can be calculated using the formula:
\[ \text{Number of neutrons} = \text{Mass number} - \text{Number of protons} = 40 - 20 = 20. \]
- Therefore, calcium has 20 neutrons.

3. **Protons and neutrons are shown in the nucleus**:
- In the geometrical representation, we will depict the nucleus of the calcium atom containing 20 protons and 20 neutrons.

4. **Writing the electronic configuration of the atom**:
- The electronic configuration for calcium (with 20 electrons) is:
\[ 2, 8, 8, 2. \]
- This means there are 2 electrons in the first shell, 8 in the second, 8 in the third, and 2 in the fourth shell.

5. **Arrange the electrons in shells around the nucleus following the electronic configuration**:
- Based on the electronic configuration, we will arrange the electrons in their respective shells around the nucleus.

### Final Order of Steps:
1. Identification of the atomic number and mass number of the atom.
2. Calculation of the number of protons and neutrons.
3. Protons and neutrons are shown in the nucleus.
4. Writing the electronic configuration of the atom.
5. Arrange the electrons in shells around the nucleus following the electronic configuration.